CODEWITHSUNDEEP
c++
knh170
knh170

Reputation: 2990

How to construct a vector of queues?

I need to construct a crawler working with front_queues and back_queues, which are vectors of queues. I've seen solutions in this question Vector of queues but my compiler complains the vec needs a constructor.

#include <vector>
#include <queue>

using namespace std;

vector<queue<int> > vec;
vec.push_back( queue<int>(0) );
// ^
// error: expected constructor, destructor, or type conversion before ‘.’ token

Upvotes: 1

Views: 1882

Answers (1)

Telokis
Telokis

Reputation: 3389

You need to put function calls inside blocks.

Try adding a main function :

#include <vector>
#include <queue>

using namespace std;

int main()
{
    vector<queue<int> > vec;
    queue<int>          q;

    vec.push_back(q);
    return (0);
}

queuedoesn't have initializer list :

According to queue's constructor reference (Source), you can't use queue<int>(0) because no proper constructor would match. However, you can use queue<int>(). It will create an empty queue. Take a look at this online example : https://ideone.com/RbT1pD

Upvotes: 5

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